Liquid Crystal Display Pixel Electrode Asymmetric Stems
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Solution Overview
Problem
Vertically aligned liquid crystal displays face challenges in achieving accurate gray scale representation and side visibility quality comparable to front visibility, particularly in low and high gray scale regions, due to increased luminance and difficulty in gray scale expression when pixels are divided into sub-pixels with different voltages.
Innovation Solution
The liquid crystal display design includes a pixel electrode divided into subpixel electrodes with specific stem and branch configurations, where the width and cutouts of the transverse and longitudinal stems of the subpixel electrodes are optimized to control the electric field and alignment of liquid crystal molecules, reducing luminance in gray scale regions and enhancing side visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If one pixel is divided into two sub-pixels with different voltages to increase side visibility quality, then side visibility quality is improved, but luminance increases at low and high gray scales making gray scale expression difficult
Solution Approach 1:
The pixel electrode is divided into first and second subpixel electrodes with different area ratios (first subpixel electrode area < second subpixel electrode area). This segmentation allows different voltage applications to control liquid crystal molecules in different regions, improving side visibility while maintaining gray scale expression through asymmetric area distribution.
Solution Approach 2:
The first subpixel electrode is designed with a transverse stem having greater width than the longitudinal stem, creating local quality differences. The transverse stem width is specifically increased to control luminance in the low gray scale region, while the longitudinal stem maintains standard dimensions. This local modification enables precise control of gray scale expression without compromising side visibility quality.
2Measurement precision
If the transverse stem width is increased to control luminance in low gray scale region, then gray scale expression is improved, but device complexity increases
Solution Approach 1:
The first subpixel electrode employs asymmetric stem design where the transverse stem width is deliberately made greater than the longitudinal stem width. This asymmetric configuration creates different electric field distributions in horizontal and vertical directions, enabling precise control of luminance for gray scale expression. The asymmetry is implemented through simple dimensional modification rather than complex structural additions, minimizing device complexity while achieving the desired optical control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design allows for accurate gray scale representation in low and high gray scale regions while maintaining side visibility quality close to front visibility, preventing deterioration in display quality such as stripes.
Implementation Method 1
a voltage is applied to the field generating electrodes to generate an electric field in the liquid crystal layer, which determines the orientation direction of liquid crystal molecules
Implementation Method 2
the long axes of the liquid crystal molecules are arranged to be perpendicular to the display panel in the state in which an electric field is not applied
Data Source
AI summary
A liquid crystal display, including a first substrate; a gate line and a data line disposed on the first substrate; and a pixel electrode connected to the gate line and the data line and comprising a first sub pixel electrode and a second sub pixel electrode disposed on the first substrate. Each of the first sub pixel electrode and the second sub pixel electrode includes a transverse stem; a longitudinal stem; and a plurality of minute branches extending from transverse stem and the longitudinal stem. A width of the first sub pixel electrode is different from a width of the second sub pixel electrode.